import { layoutConfig } from './layout';

export type SearchProvider = {
  id: 'baidu' | 'bing' | 'google' | 'zhihu';
  label: string;
  url: string;
  placeholder: string;
};

export const searchProviders: SearchProvider[] = [
  {
    id: 'baidu',
    label: '百度',
    url: 'https://www.baidu.com/s?wd=',
    placeholder: '百度一下',
  },
  {
    id: 'bing',
    label: '必应',
    url: 'https://www.bing.com/search?q=',
    placeholder: '搜索必应',
  },
  {
    id: 'google',
    label: '谷歌',
    url: 'https://www.google.com/search?q=',
    placeholder: '搜索谷歌',
  },
  {
    id: 'zhihu',
    label: '知乎',
    url: 'https://www.zhihu.com/search?q=',
    placeholder: '知乎搜索',
  },
];

export type SearchProviderId = SearchProvider['id'];

export const getSearchProvider = (id?: string) =>
  searchProviders.find(item => item.id === id) ?? searchProviders[0];

export type ThemePreset = {
  id: 'default' | 'warm' | 'sea' | 'forest';
  label: string;
  overlay: string;
  image: string;
};

export const themePresets: ThemePreset[] = [
  {
    id: 'default',
    label: '默认',
    overlay: 'none',
    image: "url('/bg.png')",
  },
  {
    id: 'warm',
    label: '暖阳',
    overlay: 'linear-gradient(135deg, rgba(255, 185, 110, 0.32), rgba(255, 221, 149, 0.14))',
    image: "url('/bg.png')",
  },
  {
    id: 'sea',
    label: '海盐',
    overlay: 'linear-gradient(135deg, rgba(88, 200, 255, 0.3), rgba(183, 240, 255, 0.14))',
    image: "url('/bg.png')",
  },
  {
    id: 'forest',
    label: '松林',
    overlay: 'linear-gradient(135deg, rgba(96, 198, 137, 0.28), rgba(217, 247, 201, 0.12))',
    image: "url('/bg.png')",
  },
];

export type ThemePresetId = ThemePreset['id'];

export const getThemePreset = (id?: string) =>
  themePresets.find(item => item.id === id) ?? themePresets[0];

const clamp = (value: number, min: number) => (value < min ? min : value);
const clampRange = (value: number, min: number, max: number) =>
  Math.min(Math.max(value, min), max);

export type LayoutDensityPreset = {
  value: number;
  label: string;
  cellSize: number;
  gap: number;
};

const baseGrid = layoutConfig.grid;
const baseIcon = layoutConfig.icon;

export const layoutDensityPresets: LayoutDensityPreset[] = [
  {
    value: 1,
    label: '宽松',
    cellSize: baseGrid.cellSize + 16,
    gap: baseGrid.gap + 10,
  },
  {
    value: 2,
    label: '标准',
    cellSize: baseGrid.cellSize,
    gap: baseGrid.gap,
  },
  {
    value: 3,
    label: '紧凑',
    cellSize: clamp(baseGrid.cellSize - 18, 76),
    gap: clamp(baseGrid.gap - 6, 8),
  },
  {
    value: 4,
    label: '更紧凑',
    cellSize: clamp(baseGrid.cellSize - 32, 64),
    gap: clamp(baseGrid.gap - 10, 4),
  },
];

export const layoutDensityRange = {
  min: 1,
  max: 4,
  step: 0.1,
  default: 2,
};

export const getLayoutDensityPreset = (value?: number) => {
  const normalized = clampRange(
    typeof value === 'number' ? value : layoutDensityRange.default,
    layoutDensityRange.min,
    layoutDensityRange.max
  );
  const lower = Math.floor(normalized);
  const upper = Math.ceil(normalized);
  if (lower === upper) {
    return layoutDensityPresets[lower - 1] ?? layoutDensityPresets[1];
  }
  const lowerPreset = layoutDensityPresets[lower - 1] ?? layoutDensityPresets[0];
  const upperPreset = layoutDensityPresets[upper - 1] ??
    layoutDensityPresets[layoutDensityPresets.length - 1];
  const t = (normalized - lower) / (upper - lower);
  return {
    value: normalized,
    label: t < 0.5 ? lowerPreset.label : upperPreset.label,
    cellSize: Math.round(lowerPreset.cellSize + (upperPreset.cellSize - lowerPreset.cellSize) * t),
    gap: Math.round(lowerPreset.gap + (upperPreset.gap - lowerPreset.gap) * t),
  };
};

export const iconDensityRange = {
  min: 0,
  max: 50,
  step: 1,
  default: 25,
};

const iconDensityScaleRange = {
  loose: 2,
  dense: 0,
};

export const getIconDensityScale = (value?: number) => {
  const normalized = clampRange(
    typeof value === 'number' ? value : iconDensityRange.default,
    iconDensityRange.min,
    iconDensityRange.max
  );
  const ease = (t: number) => Math.pow(t, 0.5);
  if (normalized === iconDensityRange.default) {
    return 1;
  }
  if (normalized < iconDensityRange.default) {
    // Smaller slider value = denser布局
    const t = (iconDensityRange.default - normalized) /
      (iconDensityRange.default - iconDensityRange.min);
    return 1 - ease(t) * (1 - iconDensityScaleRange.dense);
  }

  const t = (normalized - iconDensityRange.default) /
    (iconDensityRange.max - iconDensityRange.default);
  return 1 + ease(t) * (iconDensityScaleRange.loose - 1);
};

export const iconSizeRange = {
  min: 70,
  max: 100,
  step: 1,
  default: Math.round(
    ((baseGrid.cellSize - baseIcon.padding * 2) / baseGrid.cellSize) * 100
  ),
};

export const iconRadiusRange = {
  min: 0,
  max: 24,
  step: 1,
  default: baseIcon.radius,
};